<template>
  <div>
    <el-upload
      :action="uploadUrl"
      :before-upload="handleBeforeUpload"
      :on-success="handleUploadSuccess"
      :on-error="handleUploadError"
      name="file"
      :show-file-list="false"
      :headers="headers"
      style="display: none"
      ref="upload"
      v-if="this.type == 'url'"
    >
    </el-upload>
    <div class="editor" ref="editor" :style="styles"></div>
  </div>
</template>

<script>
import axios from "axios"
import Quill from "quill"
import "quill/dist/quill.core.css"
import "quill/dist/quill.snow.css"
import "quill/dist/quill.bubble.css"
// import { getToken } from "@/utils/auth"
import { BASE_API } from '@/utils/constants'

export default {
  name: "Editor",
  props: {
    /* 编辑器的内容 */
    value: {
      type: String,
      default: "",
    },
    /* 高度 */
    height: {
      type: Number,
      default: null,
    },
    /* 最小高度 */
    minHeight: {
      type: Number,
      default: null,
    },
    /* 只读 */
    readOnly: {
      type: Boolean,
      default: false,
    },
    /* 上传文件大小限制(MB) */
    fileSize: {
      type: Number,
      default: 5,
    },
    /* 类型（base64格式、url格式） */
    type: {
      type: String,
      default: "url",
    },
    /* 自定义上传接口 */
    uploadUrl: {
      type: String,
      default: null,
    },
    /* 上传类型参数 */
    uploadType: {
      type: Number,
      default: null,
    },
    /* 是否使用自定义图片处理器 */
    useCustomImageHandler: {
      type: Boolean,
      default: false,
    }
  },
  data() {
    return {
      Quill: null,
      currentValue: "",
      options: {
        theme: "snow",
        bounds: document.body,
        debug: "warn",
        modules: {
          // 工具栏配置
          toolbar: [
            ["bold", "italic", "underline", "strike"],       // 加粗 斜体 下划线 删除线
            ["blockquote", "code-block"],                    // 引用  代码块
            [{ list: "ordered" }, { list: "bullet" }],       // 有序、无序列表
            [{ indent: "-1" }, { indent: "+1" }],            // 缩进
            [{ size: ["small", false, "large", "huge"] }],   // 字体大小
            [{ header: [1, 2, 3, 4, 5, 6, false] }],         // 标题
            [{ color: [] }, { background: [] }],             // 字体颜色、字体背景颜色
            [{ align: [] }],                                 // 对齐方式
            ["clean"],                                       // 清除文本格式
            ["link", "image", "video"]                       // 链接、图片、视频
          ],
        },
        placeholder: "请输入内容",
        readOnly: this.readOnly,
      },
    }
  },
  computed: {
    styles() {
      let style = {}
      if (this.minHeight) {
        style.minHeight = `${this.minHeight}px`
      }
      if (this.height) {
        style.height = `${this.height}px`
      }
      return style
    },
    headers() {
      return {
        // Authorization: "Bearer " + getToken()
      }
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val !== this.currentValue) {
          this.currentValue = val === null ? "" : val
          if (this.Quill) {
            this.Quill.clipboard.dangerouslyPasteHTML(this.currentValue)
          }
        }
      },
      immediate: true,
    },
  },
  mounted() {
    this.init()
  },
  beforeDestroy() {
    if (this.Quill && this.Quill.root) {
      // 移除事件监听器
      this.Quill.root.removeEventListener('paste', this.handlePasteCapture, true)
      this.Quill.root.removeEventListener('dragover', this.handleDragOver, false)
      this.Quill.root.removeEventListener('dragleave', this.handleDragLeave, false)
      this.Quill.root.removeEventListener('drop', this.handleDrop, false)
    }
    this.Quill = null
  },
  methods: {
    init() {
      try {
        const editor = this.$refs.editor
        if (!editor) {
          console.error('Editor element not found')
          return
        }
        
        this.Quill = new Quill(editor, this.options)
        
        // 如果使用自定义图片处理器
        if (this.useCustomImageHandler) {
          let toolbar = this.Quill.getModule("toolbar")
          toolbar.addHandler("image", (value) => {
            if (value) {
              // 触发自定义图片处理器
              this.handleCustomImageUpload()
            } else {
              this.Quill.format("image", false)
            }
          })
          this.Quill.root.addEventListener('paste', this.handlePasteCapture, true)
          
          // 添加拖拽上传功能
          this.Quill.root.addEventListener('dragover', this.handleDragOver, false)
          this.Quill.root.addEventListener('dragleave', this.handleDragLeave, false)
          this.Quill.root.addEventListener('drop', this.handleDrop, false)
        }
        // 如果设置了上传地址则使用原有的图片上传事件
        else if (this.type == 'url') {
          let toolbar = this.Quill.getModule("toolbar")
          toolbar.addHandler("image", (value) => {
            if (value) {
              // 检查上传组件是否存在
              if (this.$refs.upload && this.$refs.upload.$children[0] && this.$refs.upload.$children[0].$refs.input) {
                this.$refs.upload.$children[0].$refs.input.click()
              } else {
                console.error('Upload component not properly initialized')
                this.$message.error('图片上传组件初始化失败')
              }
            } else {
              this.Quill.format("image", false)
            }
          })
          this.Quill.root.addEventListener('paste', this.handlePasteCapture, true)
        }
        
        this.Quill.clipboard.dangerouslyPasteHTML(this.currentValue)
        
        this.Quill.on("text-change", (delta, oldDelta, source) => {
          const html = this.$refs.editor.children[0].innerHTML
          const text = this.Quill.getText()
          const quill = this.Quill
          this.currentValue = html
          this.$emit("input", html)
          this.$emit("on-change", { html, text, quill })
        })
        
        this.Quill.on("text-change", (delta, oldDelta, source) => {
          this.$emit("on-text-change", delta, oldDelta, source)
        })
        
        this.Quill.on("selection-change", (range, oldRange, source) => {
          this.$emit("on-selection-change", range, oldRange, source)
        })
        
        this.Quill.on("editor-change", (eventName, ...args) => {
          this.$emit("on-editor-change", eventName, ...args)
        })
        
        console.log('Editor initialized successfully')
      } catch (error) {
        console.error('Editor initialization failed:', error)
        this.$message.error('编辑器初始化失败: ' + (error.message || '未知错误'))
      }
    },
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      const type = ["image/jpeg", "image/jpg", "image/png", "image/svg"]
      const isJPG = type.includes(file.type)
      // 检验文件格式
      if (!isJPG) {
        this.$message.error(`图片格式错误!`)
        return false
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$message.error(`上传文件大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      return true
    },
    handleUploadSuccess(res, file) {
      // 如果上传成功
      if (res.code == 200) {
        // 获取富文本组件实例
        let quill = this.Quill
        // 获取光标所在位置
        let length = quill.getSelection() ? quill.getSelection().index : 0
        
        // 处理图片URL，支持多种返回格式
        let imageUrl = res.fileName || res.url || res.newFileName
        
        // 如果 fileName 是相对路径，需要拼接完整的URL
        if (imageUrl && !imageUrl.startsWith('http') && !imageUrl.startsWith('data:')) {
          if (imageUrl.startsWith('/')) {
            // 如果是绝对路径，直接使用
            imageUrl = BASE_API + imageUrl
          } else {
            // 如果是相对路径，拼接基础URL
            imageUrl = BASE_API + '/' + imageUrl
          }
        }
        
        // 插入图片
        quill.insertEmbed(length, "image", imageUrl)
        // 调整光标到最后
        quill.setSelection(length + 1)
        
        console.log('图片插入成功:', imageUrl)
        this.$message.success('图片上传成功')
      } else {
        console.error('图片上传失败:', res)
        this.$message.error("图片插入失败: " + (res.msg || '未知错误'))
      }
    },
    handleUploadError() {
      this.$message.error("图片插入失败")
    },
    // 复制粘贴图片处理
    handlePasteCapture(e) {
      const clipboard = e.clipboardData || window.clipboardData
      if (clipboard && clipboard.items) {
        for (let i = 0; i < clipboard.items.length; i++) {
          const item = clipboard.items[i]
          if (item.type.indexOf('image') !== -1) {
            e.preventDefault()
            const file = item.getAsFile()
            if (file) {
              // 如果使用自定义处理器，触发自定义上传
              if (this.useCustomImageHandler) {
                const range = this.Quill.getSelection()
                const cursorLocation = range ? range.index : 0
                this.$emit('image-added', file, this.Quill, cursorLocation, () => {})
              } else {
                // 否则使用默认上传
                this.insertImage(file)
              }
            }
          }
        }
      }
    },
    insertImage(file) {
      const formData = new FormData()
      formData.append("file", file)
      // 只有当uploadType不为null且不为undefined时才添加到表单数据中
      if (this.uploadType !== null && this.uploadType !== undefined) {
        formData.append("type", this.uploadType)
      }
      axios.post(this.uploadUrl, formData, { 
        headers: { 
          "Content-Type": "multipart/form-data", 
          Authorization: this.headers.Authorization 
        } 
      }).then(res => {
        this.handleUploadSuccess(res.data)
      }).catch(error => {
        console.error('图片上传失败:', error)
        this.$message.error("图片上传失败: " + (error.message || '未知错误'))
      })
    },
    
    // 自定义图片处理器 - 参考Vue2Editor官方文档
    handleCustomImageUpload() {
      // 创建文件输入元素
      const input = document.createElement('input')
      input.setAttribute('type', 'file')
      input.setAttribute('accept', 'image/*')
      input.setAttribute('multiple', 'false')
      
      // 定义事件处理函数
      const handleChange = () => {
        const file = input.files[0]
        if (file) {
          console.log('文件已选择:', file.name, file.size)
          
          // 验证文件
          if (!this.handleBeforeUpload(file)) {
            input.value = ''
            return
          }
          
          // 获取光标位置
          const range = this.Quill.getSelection()
          const cursorLocation = range ? range.index : 0
          
          console.log('触发image-added事件，光标位置:', cursorLocation)
          console.log('准备触发事件，参数:', { file: file.name, Editor: this.Quill, cursorLocation })
          
          // 触发image-added事件，让父组件处理上传
          this.$emit('image-added', file, this.Quill, cursorLocation, () => {
            // 重置上传器
            input.value = ''
            console.log('上传器已重置')
          })
          
          console.log('事件已触发')
        }
        
        // 清理事件监听
        input.removeEventListener('change', handleChange)
        input.removeEventListener('cancel', handleCancel)
      }
      
      const handleCancel = () => {
        console.log('文件选择已取消')
        input.value = ''
        input.removeEventListener('change', handleChange)
        input.removeEventListener('cancel', handleCancel)
      }
      
      // 添加事件监听
      input.addEventListener('change', handleChange)
      input.addEventListener('cancel', handleCancel)
      
      // 触发文件选择
      input.click()
    },
    
    // 拖拽处理
    handleDragOver(e) {
      e.preventDefault()
      e.stopPropagation()
      this.Quill.root.classList.add('drag-over')
    },
    
    handleDragLeave(e) {
      e.preventDefault()
      e.stopPropagation()
      // 只有当鼠标真正离开编辑器区域时才移除样式
      if (!this.Quill.root.contains(e.relatedTarget)) {
        this.Quill.root.classList.remove('drag-over')
      }
    },
    
    handleDrop(e) {
      e.preventDefault()
      e.stopPropagation()
      
      // 恢复样式
      this.Quill.root.classList.remove('drag-over')
      
      const files = e.dataTransfer.files
      if (files && files.length > 0) {
        for (let i = 0; i < files.length; i++) {
          const file = files[i]
          if (file.type.startsWith('image/')) {
            // 验证文件
            if (!this.handleBeforeUpload(file)) {
              continue
            }
            
            // 获取拖拽位置
            const range = this.Quill.getSelection()
            const cursorLocation = range ? range.index : 0
            
            // 触发自定义上传
            this.$emit('image-added', file, this.Quill, cursorLocation, () => {})
          }
        }
      }
    }
  }
}
</script>

<style>
.editor, .ql-toolbar {
  white-space: pre-wrap !important;
  line-height: normal !important;
}

/* 拖拽样式 */
.ql-editor {
  transition: all 0.3s ease;
}

.ql-editor.drag-over {
  border-color: #409eff !important;
  background-color: #f0f9ff !important;
}
.quill-img {
  display: none;
}
.ql-snow .ql-tooltip[data-mode="link"]::before {
  content: "请输入链接地址:";
}
.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;
  content: "保存";
  padding-right: 0px;
}
.ql-snow .ql-tooltip[data-mode="video"]::before {
  content: "请输入视频地址:";
}
.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
  content: "14px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="small"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="small"]::before {
  content: "10px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="large"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="large"]::before {
  content: "18px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="huge"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="huge"]::before {
  content: "32px";
}
.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: "文本";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
  content: "标题1";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
  content: "标题2";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
  content: "标题3";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
  content: "标题4";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
  content: "标题5";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
  content: "标题6";
}
.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: "标准字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
  content: "衬线字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
  content: "等宽字体";
}
</style>
